linux-kernel - Re: [PATCH v3 16/16] objtool,x86: Rewrite retpoline thunk calls

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Message-ID: <YL8+zeC9xjpzA81j@hirez.programming.kicks-ass.net>
Date:   Tue, 8 Jun 2021 11:56:29 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     Nathan Chancellor <nathan@...nel.org>,
        Fāng-ruì Sòng <maskray@...gle.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>, lma@...ihalf.com,
        Guenter Roeck <groeck@...gle.com>,
        Juergen Gross <jgross@...e.com>, lb@...ihalf.com,
        LKML <linux-kernel@...r.kernel.org>, mbenes@...e.com,
        Radosław Biernacki <rad@...ihalf.com>,
        upstream@...ihalf.com,
        "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        Sami Tolvanen <samitolvanen@...gle.com>
Subject: Re: [PATCH v3 16/16] objtool,x86: Rewrite retpoline thunk calls

On Mon, Jun 07, 2021 at 01:54:37PM -0700, Nick Desaulniers wrote:
> The only thing that's still different is that the `file` command still
> prints "no section header."
> 
> $ find . -name \*.lto.o | xargs file | rev | cut -d , -f 1 | rev |
> sort | uniq -c
>       1  no section header

That's not due to objtool, is it?

$ file amdgpu.lto.o.orig
amdgpu.lto.o.orig: ELF 64-bit LSB relocatable, x86-64, version 1 (SYSV), no section header